What thickness of metal should I use to make my roll hoop for a Haynes Roadster? Im going bike engined so it will be lighter than the prototype?
Many Thanks Jas Gray
Weight of car has little to do with the roll bar, stick with the recommended size in the book, which I think is 50mm dia x 3mm thick CRS. It's
there for your safety, so heavy is good. Cheers Ray
Im not too worried about how much it weighs, obviously its safety first.!
You will find bending CDS challenging, I had mine bent proffesionally to my own design after kinking a couple of bits.
ERW is easier and cheaper, if you want MSA spec then CDS is the chap to go for based upon the MSA blue book regulation sizes.
Quite often on Ebay sellers do flat pack ERW hoops and stays.
Regards Mark
quote:
Originally posted by Chippy
Weight of car has little to do with the roll bar, stick with the recommended size in the book, which I think is 50mm dia x 3mm thick CRS. It's there for your safety, so heavy is good. Cheers Ray
It sure was shiny though!!! Doh!!!
Some time ago a clan crusader (if memory is working) passed all inspections to go rallying, its rollover protection was made of fiberglass.
Robin Hood aka great british spots cars hoops are made from 50 x 1.5mm stainless
SVA inspector told me the roll cage for the RH Lightweight was made from finest exhaust tubing (accourding to the bloke that made the chassis)
Hi
If doing the job you may as well do it properly.
In which case use the Min spec for MSA 45mm x 2.5mm or 50mm x 2mm material CDS min yield strength 350 N/mm2 . The desighn would also have to
incorporate two rear stays for support. And technically the main hoop will want to be 50mm above your head when wearing a helmet so say 65mm above
without one.
At least when the trackday organisers are in future asking for MSA spec roll bars you will OK if you ever fancy doing a trackday.
Cheers Matt